type_cast_calculated_value

# File activerecord/lib/active_record/calculations.rb, line 284
        def type_cast_calculated_value(value, column, operation = nil)
          operation = operation.to_s.downcase
          case operation
            when 'count' then value.to_i
            when 'sum'   then type_cast_using_column(value || '0', column)
            when 'avg'   then value && (value.is_a?(Fixnum) ? value.to_f : value).to_d
            else type_cast_using_column(value, column)
          end
        end